California
September
Weather in California for September 2025
Your guide to California weather in September - trends and predictions
In general, the average temperature in California at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.6 °F by the end of September.
With an average of 2 rainy days, California experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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28
Dry days
2
Rainy days
0
Snow days
26°/17°
Temperatures
16 km/h
Avg max wind
65 %
Avg humidity
California in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  28° | 3  28° | 4 30° | 5  32° | 6 32° | 7 33° |
| 8 35° | 9 36° | 10 31° | 11 29° | 12 28° | 13 26° | 14 26° |
| 15 25° | 16 24° | 17 23° | 18 23° | 19 22° | 20 22° | 21  21° |
| 22 24° | 23 26° | 24 26° | 25 26° | 26 25° | 27 26° | 28 26° |
| 29 25° | 30 25° |
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Temperatures trend during September in California
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Partly cloudy | 28° /20° | 0 mm | 7 | |
| Sept. 2 | Cloudy | 28° /21° | 0 mm | 7 | |
| Sept. 3 | Overcast | 28° /20° | 0 mm | 7 | |
| Sept. 4 | Cloudy | 30° /19° | 0 mm | 7 | |
| Sept. 5 | Mist | 32° /21° | 0 mm | 8 | |
| Sept. 6 | Cloudy | 32° /22° | 0 mm | 8 | |
| Sept. 7 | Cloudy | 33° /21° | 0 mm | 8 | |
| Sept. 8 | Partly cloudy | 35° /24° | 0 mm | 9 | |
| Sept. 9 | Partly cloudy | 36° /25° | 0 mm | 9 | |
| Sept. 10 | Overcast | 31° /22° | 0 mm | 8 | |
| Sept. 11 | Cloudy | 29° /20° | 0 mm | 7 | |
| Sept. 12 | Cloudy | 28° /19° | 0 mm | 7 | |
| Sept. 13 | Cloudy | 26° /18° | 0 mm | 6 | |
| Sept. 14 | Overcast | 26° /17° | 0 mm | 7 | |
| Sept. 15 | Mist | 25° /17° | 0 mm | 6 | |
| Sept. 16 | Mist | 24° /17° | 0.1 mm | 6 | |
| Sept. 17 | Mist | 23° /16° | 0 mm | 6 | |
| Sept. 18 | Overcast | 23° /15° | 0 mm | 6 | |
| Sept. 19 | Mist | 22° /16° | 0 mm | 5 | |
| Sept. 20 | Overcast | 22° /15° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 21° /15° | 0.2 mm | 5 | |
| Sept. 22 | Overcast | 24° /15° | 0 mm | 6 | |
| Sept. 23 | Cloudy | 26° /17° | 0 mm | 7 | |
| Sept. 24 | Mist | 26° /15° | 0 mm | 7 | |
| Sept. 25 | Cloudy | 26° /15° | 0 mm | 7 | |
| Sept. 26 | Cloudy | 25° /15° | 0 mm | 6 | |
| Sept. 27 | Partly cloudy | 26° /16° | 0 mm | 6 | |
| Sept. 28 | Cloudy | 26° /15° | 0 mm | 6 | |
| Sept. 29 | Cloudy | 25° /16° | 0 mm | 6 | |
| Sept. 30 | Light rain shower | 25° /16° | 0.9 mm | 6 | |
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Important Notice
Our weather forecast for California in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the California forecast closer to your planned date for the most up-to-date weather information.
California in September - FAQ
What are the expected maximum and minimum temperatures in California during September?
During September, expect a variety of temperatures with highs around 26° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in California during September?
Rainfall in California during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in California during September?
The average wind speed in California during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
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